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Journal of Mining Sciences

2019 year, number 4

Modeling the Explosive Effect on Gas-Dynamic State of Outburst-Hazardous Coal Band

V. N. Odintsev, I. E. Shipovskii
Institute of Integrated Mineral Development, Russian Academy of Sciences, Kryukovskii tupik 4, Moscow, 111020 Russia
Keywords: перемятый уголь, выбросы угля и газа, взрывное воздействие, метанонасыщенный пласт, предразрушение, компьютерное моделирование, Crushed coal, coal and gas outbursts, explosive effect, methane-bearing seam, prefailure, computer modeling

Abstract

The preparation mechanism for gas-dynamic failure of outburst-hazardous coal band during an explosive effect on a coal seam is considered. The conditions for crack formation in the zone farthest from the blast hole were studied, as well as modeling of induced cracks filling with methane, which was initially in coal in a dissolved state, and estimation of the time of crack development start due to the pressure of free methane. It has been established that, depending on the mechanical and diffusion parameters of coal, the start time for crack development can vary from tens of seconds to many hours. The study results will be useful in developing a theory of explosive effect on a coal seam in a set of measures to reduce the risk of sudden outbursts of coal and gas.